Tag Archives: reed relay

Relays
Relays are electronic or electromechanical switches that operate under the control of an external circuit.
Originally when first invented in 1835, electromechanical relays consisted of an electromagnet and a set of contacts. When the electromagnet was energized, it closed the contact by attracting a lever held by a spring. When no current is flowing through the circuit, the electromagnet got demagnetized and the spring pulled back the lever and the circuit was left open. This type of Read more [...]